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The EPID and Rodeo 1.1 package is able to detect
isocenter misalignments with 0.2mm accuracy, i.e, about the repeatability found
for the film method. This method can be considered a valid one due to the fact
that the Bland-Altman analysis depicts small bias values when comparing with
the film based technique. Also, the limits of agreement are comparables to the
inter-observer differences observed in the film case.
In conclusion, this study emphasises the benefit of using EPID-Rodeo 1.1 in
evaluating the isocenter alignment and at the same time supposes a saving of
time and not observer-dependence in relation to the old film procedure.